Carbureter.



A. G. IONIDESQ CARBUBETBR. APPLICATION 21mm zruma, woe.

Patented Dec. 19, 1911.

4 SHEETS-SHEET 1.

Ink eni'o r- A). aria.

Wii'hesk e s;

A. G. IONIDBS.

GARBURBTBR.

APELIGATIQN FILED JAN. 26, 1909.

Patented Dec. 19, 1911.

4 SHEETS-SHEET 2.

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GAEBURETEB.

APPLICATION FILED JLILBG. 190a Patented Dem-19,1911.

umrnn srnrns PATENT OFFICE.

ALEXANDER GEORGE IONIJJES, OF LEICESTER, ENGLAND, ASSIGNOB F ONE-THIRDTO JOSEPH WALLACE GODDARD AND ONE-THIRD TO DENZIL JOHN JARVIS; BOTH OILEICESTER, ENGLAND.

OARBURETER.

,011,9 0, Specification of Letters rum. P t t d 19, 1911 Applicationflied January 26, 1909. Serial No. 474,854.

To all whom it may concern:

Be it known that I, ALEXANDER Gnomes Iomons, a subject of the King ofEngland, residing at Leicester, Leieestershire, in Engin the side of thecylinder. The outlet from the mlxing chamber is preferably disposed atone end of the cylinder. The effective portion of the inlet opening maapproland, have-invented certain new anduseful priately be termed thethroat of t e carbu 50 Im rovements in Carbureters, of which the. reterinasmuch as the air is sli htly throtfol owing is a SPGClfiCfllllOIl,tled in passin therethrough and to a great This invention relates tocarburetors for internal combustion engines and has for its object toconstruct a carburetor which will automatically maintain a proximatelyconstant the roportions of uel and air in the combustib e m1xture duringvariations in the engine speed, while the fuel is also delivered intothe carbureter in such a way as to insure satisfactory vaporization.

In the present construction the fuel enters 3 is a. longitudinalsectional plan; Fig. 4

is an end elevation looking toward the outlet, and Fi 5 is a section onthe line 5-5 of Fig. 2, t e piston in the carbureter being shown inelevation.

Like letters of reference indicate the same parts throu bout thedrawings.

According to is invention the mixirg chamber has a yielding memberdispos within or forming partof it and so' constructed and arranged asto control" the dimensions of the effective portion of the air inletopening to the chamber. The fuel jets are so disposed as for example in.a con tinuous row contiguous to ,the air inlet otpeninffg, thatvariation ofthe dlmensions o the e co tive air opening causes a greateror less number offue'l jets to become operative so I that the number ofjets o erative and therefore the amount of fuel issuing from theseproportionate to the quantity throu h the opening into jets is always ofair which passes the mixing chamber. convenient construction is to makethe mixing chamber of cylindrical form the ielding member being. apiston movable wit 'n it so as to uncover a greater or less amount oftheinlet opening which is arranged as a longitudinal slot The chamber theyielding extent mingle with the fuel before the mixture enters thechamber, which for convenience is" herein referred to as the mixingchamber. Any fuel not vaporized falls on the preferably heated lowersurface of the mixin chamber and is there evaporated. imensions of thethroat openin are not only variableby the movement 0 the yielding memberwhich may take place antomatically or otherwise but there is alsoprovlded a ositive adjustment whereby the width of t e slot constitutingthe throat opening may be varied.

It is to be understood that the yielding member or piston does not closeor cover any of the fuel passage, but merely restricts the area of theair passage and the fuel opening or openlngs will be acted upon onl bythe air or suction in the open part 0 the throat.

At the end of the mixing chamber opposite to the outlet therefrom and onthe other side of the yielding member or piston this chamber opens intoanother chamber conveniently also of cylindrical form. In this chamberis disposed a yielding member conveniently in the form of a piston whichis connected to the yielding member in the mixing chamber the secondpiston having an area larger than that of the piston in the mixingchamber. The two pistons or yielding members are pressed toward theoutlet opening by means of a spring or by gravity acting through a cordover a pulley and a weight. The connection between the two pistons isconveniently in the form of a tube so as to allow of communication beingestablished between the portions of the two chambers which are on thesides of the pistons remotefrom each other. This communicating passageis conveniently provided with a non-return valve operative to allow airto flow from behind the larger piston in the direction'of the fuelmutletfrom the mixin chamber. The construction is such that w en suction takesplace in the mixing member moves so as to uncover or increase thedimensions of the throat opening this movement of the yielding memberresulting from the difference of pressure which exists on either side ofthe throat opening. This difference of pressure results in unequalforces acting on the two pistons which move and enlarge the throatopening until the difference in pressure is reduced to thatcorresponding with the tension of the spring as the demand from theengine increases. As the opening is enlarged so is the supply of fueland air increased, the former owing to a greater num ber of fu el jetsbeing brought into operation and the supply of a greater quantity of airnaturally resulting from the increased size of the opening. The generaldimensions of the throat opening hear such a relation to the areas ofthe jet orifices that the proportions of fuel and air remain constantthroughout the range of variation in the dimensions of the throat oening effected by the movement of the yiel ing member. The area of eachof those few jet openings which are first uncovered may however be madeslightly in excess of the remaining jet openin s which are preferablyall similar, but I 0 not wish to be understood as limiting the inventionto this particular construction as other arrangements will at oncesuggest themselves which will give a richer mixture when the en ine isrunning at slow speed or being starte On the air inlet side of thethroat opening there may be a passage communicating with the upper partof the float chamber so that when suction is taking place any decreasein pressure in What may be termed the air inlet chamber is communicatedto the float chamber thereby allowing unrestrained flow of fuel throughthose jets which are unmasked by the movement of the yielding member andsimultaneously preventing issue of fuel from those jets which have notyet been unmasked.

The jets throu h which the fuel issues may be constructs in someconvenient manncr. Passages lead to the jet orifices from a chamber oneside of which is formed by a sheet of wire gauze or othersuitablefiltering material which in turn lies over a correspondinglyshaped opening in the side of the float chamber. The size of theopenings in the filter is such that it is not possible for any particleto be carried through the filter which cannot pass freely through thejet orifices.

It is to be noted that the fuel jets are so disposed contiguous to thethroat opening that the orifices of all these jets are always open. Theterms operative or -ino erative as applied to these 'ets are there oreused not as many way in icating that certain of these jets have theirorifices .un covered while others are closed but that according to theposition of the yielding member or piston certain of the jets arebrought under the influence of the lower pressure or suction existing ator toward one end of the throat opening as the yielding member moves inthe manner described. On the other hand those jets which lie along theedge of that portion of the throat opening through which air cannot atthe time pass are inoperative byreaso-n of their lying outside theinfluence of the reduced pressure consequent on the suction from theengine. The cause therefore of the jets becoming operative or incerative in the sense in which they are so ere described is their beingbrought within or kept without the range of influence of the enginesuction as air 18 drawn through the throat opening and as the dimensionsof this 0 ening vary.

In the particular embo iment of the inventiou illustrated a floatchamber A is disposed at one side of the mixing chamber B a piece Cbeing disposed between them for the purpose of a convenient constructionof the fuel passages between the float chamber and mixing chamber. Themixing chamber B is conveniently formed cylindrical and has mountedco-axially with it and at the opposite end to the outlet.B the auxiliarychamber D. A cover E closes in the top of the float chamber and formsthe air inlet E. \Vithin the float chamber A is disposed the usual floatF controlling the fuel inlet valve F in some known manner. In the sideof the float chamber adjacent to the mixing chamber is formed a lar eopening A which is covered by a sheet 0 metal gauze G, or otherfiltering material carried by the piece C. This piece C is of wedgeshape havin formed in one face a series of grooves C which at the upperend terminate in jet passages 0 formed in the base of the wedge while atthe other end these grooves 0 en into a longitdinal slot C. The back orcat chamber side of the wedge piece C is hollow the slot or opening 0forming a communication between the lower portion of the s ace in thehollow back and the moves C. he gauze G covers in the bee of the wedgepiece. The face of the wedge in which'are formed the grooves 0' liesagainst a flat side B of the mixing chamber B, the grooves C thusforming ducts through which the fuel can flpass to the jets O findingits way from the cat chamber through the gauze G and down through theopening 0 which is situated on a level with the bottom of thefloat-chamber. To prevent clogging convenient to form the fuel ducts Cin this manner and employ the wedge piece C it will be appreciated thatthese ducts might be formed 1n the face of the flat side B of the mixinchamber or in some other way the piece being formed otherwise than ofwedge shape or dispensed with entirely the ducts and filterin gauze orother material being disposed 0t erwise as found convenient between thefloat chamber and mixing chamber. Also though the jets are heredescribed and shown as plain holes, yet they may be formed in some othermanner which will enable jets of sufiicient fineness to be obtained.

The mixing chamber B is conveniently cylindrical with an inlet 0 eningin the form of a longitudinal slot H t is opening being so arranged inrelation to the jet orifices that the latter are contiguous totheopening through its length. Within the chamber B is a yielding member inthe form of a piston J having a projection J which fits within theopenin H the upper edge or face of this rojection owever being soarranged as to lie just below the plane of the jet openings and thusclear of them. The piston J with its projection J forms ayielding'member or wall of the chamber B such that as the piston movesWithin the chamber B the size of the opening H is varied whilesimultaneously a larger or smaller number of jets become operative orexposed to the air passing in through the throat H.

The auxiliary chamber D practically forms an extension of the chamber Bthere being free communication between the two chambers. In theauxiliary chamber is dis-- posed a piston K which is connected with thepiston J by a tube L, this tube affording a means of communicationbetween that portion of the chamber 13 which lies on the side of thepiston J adjacent to the outlet B and the outer end of the auxiliarychamber D which lies on the remote side of the piston K. In this outerportion of the chamber D is disosed a spring L which bears a ainst theace of the piston K. The end 0 the tube L which carries the piston J isclosed by a non-return valve. A convenient construction of the arranement of this valve and the formation 0% the projection J on the pistonJ being to extend the end. of the tube L through the piston J as at LThis extended portion is screw-threaded and carries a cap J which isformed in one with the projection J. This cap is perforated as at Jthese perforations being closed by a fla valve J constituting a valvewhose outwar movement is limited b'y the curved plate J This guard plateJ and the flap valve J are attached to the cap J 2 at some point J 6which is ad'acent to the opening H this being desirab e so that airdrawn through the openingshall not interfere with the operation of thevalve. A rod M is attached to the center of the cap J and extendsthrough the tube L out through the head D of the chamber D the rodpassing freely through the cylinder head or cover D but fitting soclosely as to prevent excessive leakage. The object of this rod istwofold as in thefirst place in the event of any grit or foreign mattergetting into either of the chambers B or D and causing the pistons tojam they can be forcibly moved and freed by means of the rod M. Furtherthis rod can be marked or otherwise arranged to constitute an indicatorwhich will show the position of the piston J in the chamber B thusserving to enable the power developed by the engine to be ascertained aswill be appreciated from the explanation of the operation of themechanism'hereinafter given. The general dimensions of the throatopening H can be varied by the adjustment of the plate N which isdisposed along the side of the opening 0 posite to the jets. The forwardedge N of this plate is conveniently inclined with relation to that edgeof the opening H over which it lies so that when this plate N isadvanced over the opening H' the general dimensions ofthe latter will bereduced in such a way that the reduction is at first greater toward theend of the opening which is first effective the reduction beinggraduated toward the opposite end. The plate N is conveniently carriedon pins N on which are springs N N over the opening H. The movement ofthe plate N is however controlled by a screw N operated from the outsideof the easing or by some similar means as for example a wire connectionwith a handle or the like disposed conveniently for the .driver of theengine. The principal use of the plate N is to enable an adjustment ofthe carburetor to be made with a view to suiting varying atmosphericconditions.

As it is desirable to obtain an increased richness of the mixture at lowpowers when the effective portion of the opening H is of smalldimensions it is convenient to form that end of the opening H adjacentto the outlet B narrower or otherwise constrict it as for example byarranging a plate H which will lie across a portion of this opening andlimit the initial area of the opening to the necessary extent. Those*jets of the throat opening are preferably so formed as to allow of thepassage of a larger amount of fuel than the remainder or the majority ofthe jets as is indicated by the varying size of the passage C in Fig.

Free communication is established between the chamber formed by thecasing E leadin from the inlet opening E and the inter-i5 of the floatchamber A by a hole -tending to. force the edge N of the plate which areadjacent to this restricted pdrtion A so that there will practically beuniformity of pressure on the main inlet open ing side of thethroatopening H in the communicating portions of the chambers B and Dwhich lie between. the pistons J and K and in the float chamber A.

The operation of the. carbureter is as fol lows z-.Vv'hen suction fromthe engine takes place through the outlet opening B for the combustiblemixture the pressure in that part of the chamber B which lies on theoutlet side of the piston J is reduced, this reduction of pressure beingcommunicated through the valve J J and tube L to the fartherend of theauxiliary chamber D be hind the piston K. This pressure is naturallybelow that which exists within thecasing E and consequently in thecommunicating parts of the chambers B and D between the istons J and Kso that the diiference of t ese pressures causes movement of the pistonsJ and K in their respective chambers the movement of the piston J beingaway from the outlet opening B. This movement causes the projection J ofthe piston J to open a portion of the throat opening H at that portionof this opening which is adjacent to the outlet B. The jets contiguousto this portion of the opening H are immediately free to deliver fuelinto the effective portion of the opening and the suction through theopening causes the fuel to issue from the jets in such a state that afairly intimate mixture with the air takes piace actually in the throatopening and a thorough admixture is assured. before the combustiblemixture passes through the outlet B to the engine. It will be seen thatas the rateof suction increases the piston K will be so moved as toincrease the dimensions of the inlet or throat opening I-l.Simultaneously additional jet openings are brought into position orallowed to become operative so that the .roportions of fuel and air inthe combustib e mixture are maintained constant during variations in theengine speed. It will be appreciated that this variation takes placeautomatically in accordance with the variations in the ine demand a'ndas a result of these variations in demand and consequent variations inthe rate of suction which cause the yielding member or piston to varythe size of the throat opening. Therefore when suction from the enginetakes place theefl'ective part of the opening H will be enlarged untilthe reduction of pressure due to the flow of air through this openingattains the value determined by the tension of the spring. The rate ofsuction of an engine during each suction stroke usually is notconstantand the valve J *is so arranged that the mean vacuum orreduction of pressure in the outer end of the cylinder D is approximrely that corresponding to the maximum vacuum or reduction of pressurein the engine intake B during the suction stroke of the engine with theresult that the effective size of the opening H correspondsapproximately to the maximum demand durlng each stroke and thereforeallows the engine to draw'in a charge with a mean reduction in pressurefor the whole charge considerably below the maximum.

The described arrangement obviously allows a larger char e to be drawnin than would be possible without the use of this valve or someequivalent in the form perhaps of a dashpot. It will be clear that onlythose jets which are opposite the effective throat are operative sincethe pressure on the remainder of the jets is the same as that in thefloat chamber.

Beneath the chamber B or arranged otherwise in relation thereto as ma befound convenient is a jacket B provi ed with inlets and outlets B Heatedair ases or water can be passed through this acket if desired so as tovaporize any fuel which has not been properly broken up by spraying fromthe jets. The float chamber A may also be jacketed to enable it to beheated in the same way.

It will be understood that though in the above described constructionthe yielding member or piston J in the chamber B is arranged to beoperated automatically by the difference of pressure yet in someinstances it may be convenient to provide positive operation andconsequei'it regulation of the dimensions of the opening H by hand orotherwise than automatically.

The 0 eration of the present carbureter I think is perfectly clear fromthe specification and drawings for, while the fuel opening or openingsalways remain open and uncovered, the portion of it, (i. 6., said fuel 0ening) which is active is determined entire y by the area of the throatopening through which the air is admitted to the engine intake. Thatportion of the fuel opening which is back of the partitlon J, i. e.,remote from the opening in the throat is not exposed to the air passingin through the throat nor to the suction of the engine and,consequently, no fuel is drawn in through the same, the active area ofthe fuel opening being limited to the open portion of' the throat.

What I claim as my invention and desire to secure by Letters Patentis 1. In a carburetor, the combination of a mixing chamber having athroat ogiening for the admission of air and fuel an a delivery openingfor the mixture, a plurality of fuel assages in communication with asource of fuel sup ly, said passages opening near one side of the throatopenlng and always remaining open and uncovered, a member movable in themixing chamber and actmunication with a source of fuel supply,

ing as a partition to cut off or shield from the action of the airpassing through the throat opening those fuel passages which are on thatside of it remote from the delivery opening, and a piston operated bythe suction of the engine for moving the movable member to vary thenumber of fuel assages which are-exposed to or shielded rom the airpassing through the throat.

2. In a carburetor, the combination of a mixing chamber having a throato ning for the admission of air and fuel an a. delivery opening for themixture, a plurality of fuel assages in communicationlwith a source offuel sup ly, said passages openin near one side of e throat openm and aways remaining open and uncovere a member movable in the mixing chamberand acting as a partition to cut off or shield from the action of theair passin through the throat those fuel passages which are on that sideofit remote from the delivery opening, a piston, operated by the suctionof the cu gine and an operative connection between the piston andmovable member for movin the movable member to vary the number 0 fuelpassages which are exposed to or shielded from the action of the airpassing through i the throat.

3. In a carburetor, the combination of a mixing chamber having a throato ening for the admission of air and fuel an livery openin for themixture, means for varying the dimensions of the whole throat opening, aplurality of fuel passages in comsaid passages opening near one side 0the throat openin and always remaining open and uncovered, amembermovable 1n the mixing chamber and acting as a partition to cut off orshield from the action of the air passing through the throat those fuelpassages which are on that side of it remote from the delivery 0 suing,a piston operated by the suction o the engine and an operativeconnection between the piston and the movable member in the mixingchamber.

4. In a carburetor, the combination of a mixing chamber having a throato ening for the admission of air and fuel an a deliveryopening for themixture, a plurality of fuel passages in communication with a source 0fuel supply, said passages opening near one side of the throat openinand always remaining open and uncovers an auxiliary or extension chamberin communication with the mixing chamber, a member movable in the mixingchamber and acting as a partition to out off or shield from the actionof the air passing through the throat those fuel passages which are onthat side of it remote from the deliveryopening, a movable member in theauxilia chamber of greater area than the member in the mixmg chamber, anoperative'connection bea detween the member in the mixing chamber andthe member in the auxiliary chamber, and a communicating passage betweenthe remote portions of the mixing chamber and auxiliary chamber so thatthe outer faces of the two members are acted upon by the suction of theen inc.

5. In a car ureter, the combination of a mixing chamber having a throatopenlng for the admission of air and fuel and a de livery opening forthe mixture, a plurality of fuel assa in communication with a. source 0f fue supply, said passages opening near one side of the throat openingand always remaining open and uncovered, an auxiliary or extensionchamber in communication with the mixing chamber, a member movable inthe mixing chamber and acting as a partition to cut off "or shield fromthe action of the air passing through the throat, those fuelpassageswhich are on that side of it remote from the delivery opening, amovable member in the auxillary chamber of eater area than the member inthe mixing chamber, an operative connection between the member in themixing chamber and the member in the auxiliary chamber; a communicatingpassage between the remote portions of the mixing chamber and auxiliarychamber so that the outer faces of the two members are acted upon by thesuction of the engine, and means in the auxiliary chamber tending tomove the members in a direction opposite to that in which they are movedby the suction.

6. In a carbureter, the combination of a mixing chamber having a throato ening for the admission of air and fuel an a delivery opening for themixture, a plurality of fuel passages in communication with a source 0fuel supply, said passages opening near one side of e throat opening andalways remaining open and uncovered, an

auxiliary or extension chamber in communication with the mixing chamber,a member movable in the mixing chamber and,acting as a partition tocut,ofl' or shield from the action of the air passing through the throatthose fuel passages WlllCll are on that side of it remote from thedelivery opening, a movable member in the auxiliary chamber of greaterarea than the member in'the mixmg chamber, an operative connectionbetween the fnember 1n the mixing chamber and the member in theauxiliary chamber, a

communicating passage'between the .remote portions of the mixing chamberand auxiliary chamber so that the outer faces of the two members areacted upon by the suction of the engine, a non-return valve in such.passa go, and means in the auxiliary chamber tending to move themembers in a direction opposite to that in which they are moved by thesuction.

7. In a carburetnr, ,tlm combinationpf a:

mixing chamber having a throat opening for the admission of air and fueland a delivery opening for the mixture, a source of fuel supplycontrolled by a float valve, a plurality of fuel assages communicatingwith the source of fuel supply, said passages opening near one side ofthe throat opening and always remaining open and uncovered, an air inletto the float chamber, a member movable in the mixin chamber and actingas a partition to cut 0 or shield from the action of the air passingthrough the throat those fuel passages which are on that side of itremote from the delivery opening, a piston operated by the suction ofthe engine and an operative connection between the piston and themovable member in the mixing chamber, whereby the said member is movedto vary the number of fuel passages which are exposed to or shieldedfrom the air passing through the the throat opening, a member movable inthe mixing chamber and acting as a partition to cut off or shield fromthe action of the air passing through the throat those fuel passageswhich are on that side of it remote from the delivery opening, and meansoperated by the suction of the engine for moving the movable member tovary thenum ber of fuel passages which are exposed to or shielded fromthe action of the air passing through the throat.

9. In a carbureter, the combination of a cylindrical mixing chamberhaving a throat opening whose length is greater than its breadth formedlengthwise in one side of the mixing chamber for the admission of airand fuel and a delivery opening for the mixture at one end of thecylindrical mixing chamber, a plurality of fuel passages incommunication with a source of fuel supply, said passages openin nearone side of the throat openin an always remainin 0 on and uncovere and apiston movab e in the mixin chamber and controlled and operated. by t esuction of the engine, such piston being so formed as to act as apartitlon to cut off or shield from the action of the air passingthrough the throat thos: fuel passages which are on that side of itremote from thedelivery openinl'gl.

10. a carburetor, the combination of :1.

cylindrical mixing chamber having a throat opening whose length isgreater than its breadth formed lengthwise in one side of the mixingchamber for the admission of air and fuel and a delivery openin for themixture at one end of the cylindrical mixing chamber, a plate positionedat one of the long sides of the throat opening and movable over thewhole length of the opening to vary the dimensions of the whole of thisopening, means for moving this plate and retaining it in variouspositions, a plurality of fuel assages in communication with a source oifuel supplyysaid passages opening near one side of the throat openingand always remainin open and uncovered, and a piston mova le in themixing chamber and controlled and operated by the suction of the engine,such piston bein so formed as to act as a partition to cut 0% 01 are onthat side of it remote from the de-- livery opening. 7

11. In a carburetor, the combination of a cylindrical mixing chamberhaving a throat opening whose length is greater than its breadth formedlengthwise in one side of the mixing chamber for the admission of airand fuel and a delivery opening for the mixture at one end of the clindrical mixing chamber, a plurality of uel passages in communicationwith a source of fuel supply, said passages opening near one side of thethroat opening and always remaining open and uncovered, a piston movablein the mixin chamber and so formed as to act as a partition to out 01for shield from the action of the air passing through the throat thosefuel passages which are on that side of it remote from the deliveryopening, a ciizlindrical auxiliary chamber co-axial with t e mixingchamber and in communication with that end of the latter opposite to thedelivery opening, a piston movable within the auxiliary chamber the areaof the piston being greater than the area of the piston in the mixingchamber, and a tubular connection between the two pistons so that theirouter faces are acted upon by the suction of the en 'ne.

12. n a carburetor, the combination of a cylindrical mixing chamberhaving a throat opening whose length is greater than its breadth formedlengthwise in one side of the mixing chamber for the admission of airand fuel and a delivery opening for the mixture at one end of thecylindrical mixing chamber, a plurality of fuel assages in communicationwith "a source of uel supply, said passages opening near one side of thethroat openin and always remammg open and uncovere a piston movable inthe mixin chamber and so formed as to act as a partition to cut off orshiel'd'from the action as shield from the action of the air passing ofthe air passing through the throat those fuel passages which are on thatside of it remote from the delivery opening, a cylindrical auxiliarychamber co-axial with the mixing chamber and in communication with thatend of'the latter opposite to the delivery opening,. a piston movablewithin the auxiliary chamber the area of this piston being greater thanthe area of the piston in the mixing chamber, a tubular connectionbetween the two pistons so that their outer faces are acted upon by thesuction of the engine, and a non-return valve in the tube.

13. In a carbureter, the combination of a cylindrical mixing chamberhaving a throat opening whose length is greater than its breadth formedlengthwise in one side of the mixing chamber for the admission of airand fuel and a delivery opening for the mixture at one and of the clindrical mixing chamber, a plurality of el passages in communicationwith a source of fuel supply, said passages opening near one side of thethroat opening and always remaining open and uncovered, a piston movablein the mixing chamber and so formed as to act as a partition to cut offor shield from the action of the air passing through the throat thosefuel passa es which are on that side of it remote from t e deliveryopening, a cylindrical auxiliary chamber co-axial with the mixingchamber and in communication with that end of the latter opposite to thedelivery openin a piston movable within the auxiliary c amber the areaof this piston being greater than the area of the piston in them1xingchamber, a tubular connection between the two pistons so thattheir outer faces are acted upon by the suction of the engine, anon-return valve in the tube, and a spring in the auxiliary chambertending to move the pistons in a direction 0 posite to that in whichthey are moved by t e suction of the engine.

f 14. In a carburetor, the combination of a cylindrical mixing chamberhaving a throat opening whose length is greater than its breadth formedlengthwise in one side of the mixing chamber for the admission of airand fuel and a delivery openin for the mixture at one end of the cylinrical mixing chamber, a plurality of fuel passages in communication witha float chamber .to which fuel is supplied, said passages opening nearone side of the throat opening and always remaining open and uncovered,a casing with air inlet forming an air chamher over the throat opening,a passage forming a communication between the air chamher and the floatchamber, a filter so disposed that the fuel must pass therethrou h onits way from the float chamber to t e passages, means for heating themixing chamber, a plate positioned at one of the long sides of thethroat opening and movable over the Whole length of the opening to varythe dimensions of the whole of the opening, means for moving this plateand retaining it in varying positions, a piston movable in the mixingchamber and so formed as to act as a partition to cut ofl or shield fromthe action of the air passin through the throat those fuel assages whichare on that side of it remote rom the delivery openin ,'a cylindricalauxiliary chamber co-axia with the mixing chamber and in communicationwith that end of the latter opposite to the delivery opening, a pistonmovable within the auxiliary chamber the area of this piston beinggreater than the area of the piston in the mixing chamber, a tubularconnection between the two pistons so that their outer faces are actedupon by the suction of the engine, a non-return valve in the tubularconnection, and a spring in the auxiliary chamber tendin to move thepistons in a direction opposite to that in which they are moved by thesuction of the engine.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALEXANDER GEORGE IONIDES.

Witnesses:

WALTER BALL, F. Hoon.

Copies of this patent may be obtained for five cents each, by addressingthe 7 Commissioner of Patents,

Washington, D. 0.

